Qualm and scruple both are a feeling of doubt and hesitation but with some difference .
| Qualm | Scruple |
|---|---|
| A qualm is the uneasiness about the fitness of an action . | A scruple is the uneasiness about the fitness of an action due to a moral or ethical reason that inhibits that action . |
| There may be any reason which may lead to a qualm . | A scruple is the feeling particularly due to moral or ethical reason. |